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- #include <iostream>
- using namespace std;
- typedef long long ll;
- ll dist(ll x, ll y, ll x2, ll y2) {
- return llabs(x - x2) + llabs(y - y2);
- }
- int main() {
- ll W, H, C, R;
- cin >> W >> H >> C >> R;
- ll x = W / C;
- ll res1 = dist(x * C, x * R, W, H);
- x++;
- ll res2 = dist(x * C, x * R, W, H);
- x = H / R;
- ll res3 = dist(x * C, x * R, W, H);
- x++;
- ll res4 = dist(x * C, x * R, W, H);
- cout << min(min(res1, res2), min(res3, res4)) << endl;
- return 0;
- }
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